Tinder is a location-based social search service application (using Facebook) that facilitates communication between mutually interested users, allowing matched users to chat.
They later attended USC together and entered the Internet entrepreneurship field.
Rad has stated that the impetus for the app was his observation that "no matter who you are, you feel more comfortable approaching somebody if you know they want you to approach them." He believed that a "double opt-in" system could be created to potentially alleviate that stress.
Rad has also stated that Tinder filled a gap for social sites for meeting strangers, rather than connecting with people a user already knows.
By May 2013, Tinder was one of the top 25 social networking apps available on the web based on frequency of use and number of users.
Initially, instead of a swiping motion, users would click on either a green "heart" or red "o Xo" to select or move on from the photos shown.
As of October 2014, the app was processing over one billion swipes per day, producing about twelve million matches per day.The average user would generally spend about an hour and a half on the app each day.After transitioning from the clicking function Tinder initially used, Tinder became the first "swipe app", now a term to describe various apps that use swiping left or right to control what content the user sees in a browsing fashion.Companion apps were being developed by different companies allowing users to, for example, use the user's heart rate to determine which direction to swipe instead of the user swiping with their hands.The main companion site for Tinder has been Facebook, as Tinder users connect their Facebook profile to their Tinder accounts for verification and profile details.Chatting on Tinder is only available between two users that have swiped right on one another's photos.